1/10+4/20+9/30+16/40+25/50+36/60+49/70+64/80+81/90 08/11/2021 Bởi Alaia 1/10+4/20+9/30+16/40+25/50+36/60+49/70+64/80+81/90
$\frac{1}{10}+\frac{4}{20}+\frac{9}{30}+\frac{16}{40}+\frac{25}{50}+\frac{36}{60}+\frac{49}{70}+\frac{64}{80}+\frac{81}{90}$ $=\frac{3}{10}+\frac{9}{30}+\frac{16}{40}+\frac{25}{50}+\frac{36}{60}+\frac{49}{70}+\frac{64}{80}+\frac{81}{90}$ $=\frac{3}{5}+\frac{16}{40}+\frac{25}{50}+\frac{36}{60}+\frac{49}{70}+\frac{64}{80}+\frac{81}{90}$ $=1+\frac{25}{50}+\frac{36}{60}+\frac{49}{70}+\frac{64}{80}+\frac{81}{90}$ $=\frac{3}{2}+\frac{36}{60}+\frac{49}{70}+\frac{64}{80}+\frac{81}{90}$ $=\frac{21}{10}+\frac{49}{70}+\frac{64}{80}+\frac{81}{90}$ $=\frac{14}{5}+\frac{64}{80}+\frac{81}{90}$ $=\frac{18}{5}+\frac{81}{90}$ $=\frac{9}{2}$ Bình luận
$\frac{1}{10}+\frac{4}{20}+\frac{9}{30}+\frac{16}{40}+\frac{25}{50}+\frac{36}{60}+\frac{49}{70}+\frac{64}{80}+\frac{81}{90}$
$=\frac{3}{10}+\frac{9}{30}+\frac{16}{40}+\frac{25}{50}+\frac{36}{60}+\frac{49}{70}+\frac{64}{80}+\frac{81}{90}$
$=\frac{3}{5}+\frac{16}{40}+\frac{25}{50}+\frac{36}{60}+\frac{49}{70}+\frac{64}{80}+\frac{81}{90}$
$=1+\frac{25}{50}+\frac{36}{60}+\frac{49}{70}+\frac{64}{80}+\frac{81}{90}$
$=\frac{3}{2}+\frac{36}{60}+\frac{49}{70}+\frac{64}{80}+\frac{81}{90}$
$=\frac{21}{10}+\frac{49}{70}+\frac{64}{80}+\frac{81}{90}$
$=\frac{14}{5}+\frac{64}{80}+\frac{81}{90}$
$=\frac{18}{5}+\frac{81}{90}$
$=\frac{9}{2}$
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